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Patented May 9, I899.

J. H. SPENCER.

TELEPHONE TRANSMITTER.

(Application filed Nov. 30, 1898.)

(No Model.)

FIG.3.

FIG.2.

WITNESSE S NITED STATES- PATENT OFFICE.

JAMES H. SPENCER, OF NEW YORK, N. Y., ASSIGNOR TO SPENCER & 00.,

OF SAME PLACE.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 624,696, dated May 9, 1899.

Application filed November 30,1898. Serial No. 697,846. (No model.)

To (all whom it may concern:

Be it known that 1, JAMES H. SPENCER, of the city of New York, borough of Manhattan, in the county and State of New York,have invented a new and Improved Telephone-Transmitter, of which the following is a full, clear, and exact description.

The object of the invention is to provide certain new and useful improvements in telephone-transmitters whereby induced metallic vibrations are completely avoided'and only the intended actual sound is properly transmitted.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

' Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional side elevation of the improvement. Fig. 2 is a transverse section of the same on the line 2 2 in Fig. 1. Fig. 3 is a sectional side elevation of a modified form of the improvement, and Fig. 4 is a perspective view of the buttons and wrapper detached.

The improved telephone-transmitter is provided with a casing A, carrying the usual mouthpiece B, and formed at its inner face 3 with an annular rest A for a ring G, made of wood fiber or other non-conducting material and having a very thin cork or cloth lining O at its inner face for forming a bed for one side of the diaphragm D, engaged at its opposite side by a similar lining formed on a ring Cilikewise made of a non-conducting material and engaged bya metallic ringE,pressed in firm contact with the ring C by clampingarms F, fastened by screws G or other means to the casing A. By the arrangement described the diaphragm D is securely held in place and at the same time the metallic sound or ringing so frequent in diaphragms is taken up or deadened by the soft material linings,

thereby insuring a proper transmission of the sound. A further object of the linings on the wood-fiber rings 0 O is to provide a slight bed for the end of the diaphragm to rest in; but the bed is not soft enough to allow the diaphragm to vibrate of itself when held rig idly in place by the substantial clamping arms F above mentioned and secured tothe casing. By this arrangement swinging of the diaphragm and consequent false vibrations or undulations are completely prevented and a perfect transmission of speech takes place even in very noisy places. The diaphragm D is preferably made of a plurality of disks, with layers of tissue between the disks to prevent induced vibration, it being understood that the two thicknesses of metal held in the viselike grip of the casing or frame with a metal ring and stout clamps can only vibrate in unison with the sound-waves presented, thus overcoming the objection to the ordinary style of transmitters now used and in which the diaphragm is not held rigidly and is allowed to swing and also vibrate within itself. The double diaphragm rigidly held in place is only vibrated by the sound-waves, and by the construction described can only vibrate in sympathy with this influence, and the result is that thistransmitter, together with its auxiliary wrapper, hereinafter more fully described, varies the electrical current in harmony with the sound-waves on account of the accuracy of its vibrations, and consequently all sound is transmitted and reproduced in the natural tone. Thus the telephone by the use of the transmitter described will reproduce a whisper as accurately as the music of a brass band.

Theconstruction of the diaphragm and the means for holding it firmly in place prevent undue shrinkage or change in position, and hence when once properly adjusted requires no further attention.

On the diaphragm -D andat the middle thereof is arranged a button H, operating in conjunction with the button H, said button H being formed with a reduced neck 1-1 secured by a bolt I to the diaphragmat the center thereof. By having the reduced neck on the button H a firm contact is made be.-

tween this portion of the button and the face of the diaphragm to prevent imperfect contact and binding on the diaphragm away from the center, as is so frequently the case with buttons secured with their broad inner faces to the diaphragm. Theadjacent faces of the buttons H and II are preferably formed with concentric grooves H (see Figs. 1 and 4,) the portions left between the grooves being .polished to insure a proper contact between the buttons, it being understood that German silver or other material may be placed between the buttonsas shown, for instance, in the Letters Patent of the United States No. 596,834., granted to J. H. Spencer and M. S. Keyes on January 4., 1898. The button II is held in a cap J, formed with a stem J, secured in the hub K of a chamber K, having side arms K secured by screws K to the casing A. (See Fig. 2.) The two buttons H and II are inclosed in a wrapper L, made of flexible material and carbonized to form an auxiliary conductor, the wrapper being preferably provided with alternately -arranged slits L for breaking the current in a transverse direction. The wrapper is preferably made of flannel; but other suitable flexible material may be used, the frayed inner edges of the Wrapper contacting with the inner face of the diaphragm D for direct contact between the diaphragm and the wrapper.

A hood N is fastened to the casing A to protect the buttons and other parts on this side of the casing, and on said hood is secured an'attachin g device N for fastening the transmitter in proper position on the telephonecasing. A wire P is secured in the usual manner to the diaphragm D, and a wire P is secured to the attaching device N.

As illustrated in Fig. 3, the metal ring E is dispensed with and clamping-bars F directly engage a ring 0 made of wood fiber and havinga lining O of cork or the like on its inner face for engaging a diaphragm D. A similar ring 0 is held in a casingA to engage the opposite side of the diaphragm. Otherwise the construction is the same as above described with reference to Figs. 1, 2, and 4..

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. A telephone-transmitter, having a diaphragm composed of two thin disks, and layers of tissue between the disks, the said disks and layers being secured together only at the center, substantially as described.

2. Atelephone-transmitter, provided with a casing or frame, a diaphragm composed of thin disks, and tissue between the disks, rings for engaging the disks, and clamps on the casing and engaging the said disks, substantially as shown and described.

3. A telephone-transmitter, provided with a casing or frame, a diaphragm composed of thin disks and tissue between the disks, rings for engaging the disks, each ring having one face of soft material, clamps on the casing and engaging the said disks, and layers of tissue between the disks, substantially as shown and described.

4. A telephone-transmitter, provided with a diaphragm, and a hard non-conducting ring having on one face a lining of soft material forming a bed for said diaphragm whereby swinging of the diaphragm and consequent false vibrations or undulations are prevented, substantially as shown and described.

5. In a telephone-transmitter, a ring upon which the diaphragm rests formed of hard non-conducting material and having a lining of cork on one face, as set forth.

6. In a telephone-transmitter, the combination with a casing, and a diaphragm, of two rings arranged upon opposite sides of the diaphragm, each ring being formed of hard nonconducting material and having a lining of cork on the face which engages the diaphragm, and a clamping device for engaging one of the said rings, substantially as described.

7. A telephone-transmitter, provided with buttons and a wrapper for containing the buttons, and having alternate slits for breaking or interrupting the current around the wrapper, substantially as shown and described.

8. In a telephone-transmitter, the combina tion with a casing having on its inner face an annular rest or seat, and a diaphragm, of two rings arranged on opposite sides of the diaphragm, each ring being formed of hard nonconducting material and having a lining of cork on one face, the cork lining of each ring engaging the diaphragm, and clamping-arms engaging the outermost ring, substantially as described.

9. A telephone-transmitter, provided with buttons, and a wrapper for the same, made of flexible material carbonized to form an auxiliary conductor, substantially as shown and described.

10. A telephone-transmitter, provided with a diaphragm, buttons, and a carbonized flexible perforated wrapper for inclosing the buttons, the frayed ends of the wrapper engaging the diaphragm, substantially'as shown and described.

11. A telephone-transmitter, provided with buttons having concentric grooves in their faces, the portions between the grooves being polished to form alternate rough and polished surfaces, substantially as shown and described.

12. In a telephone-transmitter, the combination'with a casing and the diaphragm secured therein, of a button secured to the diaphragm, a second button engaging the first button, a cap in which the second button is held, provided with a stem, a wrapper for the buttons of carbonized flexible material, and a chamber secured to the cap and in the hub of which the stein-cap is secured, substantially as described.

JAMES H. SPENCER.

Witnesses:

-O. L. CHILD,

THEO. G. HOSTER.

IIO 

